gcc: fix miscompilation on mips64

gcc: fix miscompilation on mips64

We've observed strange behaviour of `systemctl status <xxx> on qemumips64.
The output of the command is like `systemctl show <xxx>', which is incorrect.

This patch is from gcc bugzilla's attachment.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81803

The patch hasn't been merged into gcc. But it does solve the above problem.

(From OE-Core rev: 3717c76eb24217c14a22f72fdd8732923729dee8)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>